Type 1 diabetes is a lifelong autoimmune condition in which the pancreas makes little or no insulin. Without enough insulin, glucose remains in the blood instead of moving into cells to be used for energy.
Type 1 diabetes is different from type 2 diabetes. Type 1 diabetes is mainly caused by immune destruction of insulin-producing beta cells, while type 2 diabetes is usually linked to insulin resistance and later loss of insulin production.
Symptoms
Symptoms can develop quickly, especially in children and young people. Common features include strong thirst, passing urine more often than usual, tiredness, unexplained weight loss, loss of muscle bulk, blurred vision and persistent infections such as thrush.
If insulin deficiency becomes severe, the body may break down fat and muscle for energy. This can lead to diabetic ketoacidosis, a dangerous emergency caused by high blood glucose, ketones and dehydration.
Cause
Type 1 diabetes is an autoimmune disease. The immune system attacks pancreatic beta cells, reducing or stopping insulin production. The exact trigger is not fully understood.
Risk is affected by genetics and environment. Having a family member with type 1 diabetes increases risk, but many people diagnosed with the condition have no close relative with it.
Diagnosis
Diagnosis usually involves blood and urine tests. Blood glucose testing shows whether glucose is raised. Urine testing can show glucose and ketones. HbA1c testing can show average blood glucose over the previous two to three months and is also used for long-term monitoring.
Clinicians may use antibody testing and C-peptide testing when the type of diabetes is unclear. Antibody tests can support an autoimmune diagnosis, while C-peptide helps assess how much insulin the body is still producing.
Treatment
The main treatment is insulin. Insulin may be given by injection, pen, pump, or a hybrid closed-loop system that combines a pump, glucose sensor and algorithm. The aim is to keep blood glucose within an agreed target range while avoiding both high and low glucose.
Management usually includes:
- regular insulin
- blood glucose testing or continuous glucose monitoring
- carbohydrate counting
- advice on food, exercise, alcohol, driving and illness
- regular HbA1c checks and screening for complications
- education and support from a specialist diabetes team
People newly diagnosed with type 1 diabetes are usually taught how to adjust insulin, recognise hypoglycaemia and hyperglycaemia, and manage illness using sick-day rules.
Complications
Short-term complications include hypoglycaemia, hyperglycaemia and diabetic ketoacidosis. Long-term high glucose can damage blood vessels and nerves.
Possible long-term complications include eye disease, kidney disease, nerve damage, foot ulcers, cardiovascular disease and sexual health problems. Good glucose management and regular screening reduce risk and help problems to be found earlier.
Living With Type 1 Diabetes
Type 1 diabetes requires daily decisions, but many people live active lives with it. Modern care often combines insulin, glucose sensors, education, structured reviews and mental health support.
The condition can be demanding because food, exercise, illness, stress, sleep and hormones can all affect glucose levels. Diabetes education is therefore a core part of care rather than an optional extra.
See Also
References
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